Add MySQL 9.1, MariaDB 11.4, and other matrix adjustments #12679

Job	Run time
Core running from build / Core running from build / Linux	2m 17s
Core running from src / Core running from src / Linux	1m 57s
Core running from build / Core running from build / Windows	4m 21s
Core running from src / Core running from src / Windows	4m 4s
Core running from build / Core running from build / MacOS	2m 20s
Core running from src / Core running from src / MacOS	2m 34s
Gutenberg running from build / Gutenberg running from build / Linux	8m 14s
Gutenberg running from src / Gutenberg running from src / Linux	8m 28s
Gutenberg running from build / Gutenberg running from build / Windows	12m 4s
Gutenberg running from build / Gutenberg running from build / MacOS	9m 51s
Gutenberg running from src / Gutenberg running from src / Windows	11m 31s
Gutenberg running from src / Gutenberg running from src / MacOS	10m 38s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 18m 19s

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